该粉末层被粘附在一起，以在腔室中建立一个固体。

The powder layers are then adhered together to create a solid within the chamber.

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研究了八种金属材料表面涂布绝缘和非绝缘粉末层在低功率密度和高功率密度的CO_2激光作用下的吸收特性。

The absorption characteristics of eight kinds of powder layers coated on common metals have been investigated using CO_2 laser beam with low and high power density.

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但是嘴唇碰到的是一些粉末一样的东西，原来他们的脸上都落了一层厚厚的灰。

But there was some powdery stuff that got in the way of his lips. Both of their faces were thickly coated with plaster.

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